Polaris Group APARCH Volatility Analysis
Volatility prediction for Tuesday, July 21st, 2026
1 Day
48.45%
1 Week
49.33%
1 Month
51.82%
Analysis last updated: Tuesday, July 21, 2026 at 07:56 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Feb 15, 2016 to Jul 17, 2026Model Insight
This asset shows a rare inverse leverage effect: positive returns raise next-day volatility 32% more than negative returns. Volatility rises more after gains than after losses, the reverse of the usual leverage effect and uncommon among risky assets. The volatility power δ = 2.19 sits above 2, so large shocks influence volatility more than quadratically, dominating the response more than in standard GARCH.
APARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.7771 | 5.83*** |
α ARCH Response to squared shocks | 0.0943 | 9.47*** |
β GARCH Volatility persistence | 0.8514 | 81.64*** |
γ leverage Additional response to negative shocks | -0.0628 | -2.04** |
δ power Transformation power | 2.1879 | 16.55*** |
Persistence:
0.953
Half-life:
14 days
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